CN101662688B - Method and device for encoding and decoding audio signal - Google Patents
Method and device for encoding and decoding audio signal Download PDFInfo
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- CN101662688B CN101662688B CN2009101623530A CN200910162353A CN101662688B CN 101662688 B CN101662688 B CN 101662688B CN 2009101623530 A CN2009101623530 A CN 2009101623530A CN 200910162353 A CN200910162353 A CN 200910162353A CN 101662688 B CN101662688 B CN 101662688B
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Abstract
The present invention provides a method and device for encoding and decoding audio signal. According to one facet of the present invention, an audio signal encoding device is provided, which comprises: a receiver for receiving at least one of a multi-channel audio signal and a first audio signal; a first encoder for loading and mixing the multi-channel audio signal to generate a second audio signal and extract a space parameter from the multi-channel audio signal; a second encoder encoding at least one of the first audio signal and the second audio signal to generate an audio signal to be encoded; and a multiplexor for performing multiplexing to the audio signal to be encoded and the space parameter, so as to generate a satellite digital multimedia broadcasting streaming.
Description
Technical field
The invention discloses a kind of Code And Decode method and device thereof of audio signal, more particularly, a kind of Code And Decode method and the device thereof that in the digital multimedia broadcast (dmb) via satellite service, can support to play the audio signal of multi channel audio signal is provided.
Background technology
DMB (DMB:Digital Multimedia Broadcasting) is meant the portable MBMS service that is used under mobile environment, watching muting video and audio frequency.DMB has the advantages that broadcasting can be provided under mobile environment, QVGA (Quarter Video GraphicsArray) promptly is provided the video and the stereo audio of level.
For DMB is provided service; Produced the receiver of variety patterns such as mobile phone built in type, computer mount type, automobile mount type thus; And omniselector, the personal multimedia player products such as (PMP:personal multimedia player) produced recently nearly all comprise the DMB receiving function; Therefore can look forward to, use the user of DMB service to increase gradually.
In addition, be accompanied by the development of multimedia coding techniques, the multimedia quality through communication network and broadcast service is just becoming and is becoming better and better.From the black-and-white TV to the color TV, the evolution to DTV and digital high-definition television is the representation that this trend is shown again.This trend is not only at video field, and in audio service for example from the single channel stereo audio, in the multichannel development of 4 channels, 5.1 channels, 7.1 channels etc., also find easily again.
Under the situation of multichannel audio, all play its sound through the place ahead, side and rear the audience, compare with the stereo audio that loud speaker only is provided with in audience the place ahead, the sound that has more presence can be provided.
Yet existing DMB system has the problem that the frequency band that under mobile environment, transmits data has restriction, therefore the stereo audio service can only be provided.
Summary of the invention
Technical scheme
One aspect of the present invention provides a kind of audio signal encoding apparatus and audio signal decoder and method thereof that sound with presence can be provided in the digital multimedia broadcast (dmb) via satellite service.
In order to reach the object of the invention, according to an aspect of the present invention, a kind of audio signal encoding apparatus is provided, it comprises: receiver receives at least one in the multi channel audio signal and first audio signal; First encoder is downloaded and is mixed said multi channel audio signal and generates second audio signal, and from said multi channel audio signal, extracts spatial parameter; Second encoder, in said first audio signal and said second audio signal at least one encoded generates the audio signal that is encoded; And multiplexer, the said audio signal that is encoded and said spatial parameter are carried out multiplexed, to generate digital multimedia broadcast (dmb) via satellite stream.
According to another aspect of the present invention; A kind of audio signal decoder is provided; It comprises: inverse multiplexer, carry out inverse multiplexer to digital multimedia broadcast (dmb) via satellite stream, and extract the audio signal that is encoded and about the spatial parameter of said audio signal; First decoder, the said audio signal that is encoded of decoding; With second decoder, generate multi channel audio signal based on said decoded audio signal and said spatial parameter.
Still according to another aspect of the present invention, a kind of audio-frequency signal coding method is provided, it comprises: receive at least one in the multi channel audio signal and first audio signal; Download and mix said multi channel audio signal and generate second audio signal, and from said multi channel audio signal, extract spatial parameter; In said first audio signal and said second audio signal at least one encoded generate the audio signal that is encoded; With the audio signal that is encoded and said spatial parameter are carried out multiplexed, to generate digital multimedia broadcast (dmb) via satellite stream.
In addition, according to another aspect of the present invention, a kind of audio signal decoding method is provided, it comprises: satellite data multimedia broadcasting stream is carried out inverse multiplexer, and extract the audio signal that is encoded and about the spatial parameter of said audio signal; The said audio signal that is encoded of decoding; With generate multi channel audio signal based on said decoded audio signal and said spatial parameter.
Technique effect
According to exemplary embodiment of the present invention, in the satellite digital broadcasting service, the sound that has more presence can be provided.
Description of drawings
Fig. 1 is the block diagram that illustrates according to the detailed structure of the code device of the audio signal of exemplary embodiment of the present invention;
Fig. 2 is the block diagram that illustrates according to the structure of the satellite dmb service generator of the code device with audio signal of exemplary embodiment of the present invention;
Fig. 3 is the block diagram that illustrates according to the detailed structure of the decoding device of the audio signal of exemplary embodiment of the present invention;
Fig. 4 is the block diagram that illustrates according to the satellite dmb terminal structure of the decoding device with audio signal of exemplary embodiment of the present invention;
Fig. 5 is the flow chart that illustrates according to the coding method of the audio signal of exemplary embodiment of the present invention; With
Fig. 6 is the flow chart that illustrates according to the coding/decoding method of the audio signal of exemplary embodiment of the present invention.
Embodiment
Below, certain exemplary embodiments of the present invention will combine accompanying drawing to carry out detailed explanation.
Fig. 1 is the block diagram that illustrates according to the detailed structure of the code device of the audio signal of exemplary embodiment of the present invention.
Audio signal encoding apparatus 100 according to an embodiment of the invention comprises receiver 110, first encoder 120, second encoder 130 and multiplexer 140.At length explain in the face of the function of each structural element down.
At least one that receiver 110 receives in the multi channel audio signal and first audio signal.
At this moment; The ordinary audio signal that first audio signal provides when meaning the satellite dmb service; According to one embodiment of present invention, first audio signal can comprise at least one in single audio signal (mono audiosignal) and the stereo audio signal (stereo audio signal).That is, receiver 110 according to an embodiment of the invention can also receive multi channel audio signal except the ordinary audio signal.
Wherein, spatial parameter means about by the additional information (sideinformation) of second audio signal that generated, also means to be used for uploading and to mix the second audio signal employed information of multi channel audio signal of decoding.That is, first encoder 120 extracts second audio signal and as the spatial parameter of additional information from the multi channel audio signal that receives.Be described below, audio signal decoder utilizes second audio signal and spatial parameter to restore multi channel audio signal.
According to one embodiment of present invention, second audio signal can comprise at least one in single audio signal and the stereo audio signal.That is, first encoder 120 can be downloaded and mix multi channel audio signal and generate single audio signal and stereo audio signal.
According to one embodiment of present invention, spatial parameter can comprise that intensity difference between sound channel (IID:Inter-Channel Intensity Difference), channel sound level difference (CLD:Channel LevelDifferences), inter-channel cross correlation join at least one in (ICC:Inter-Channel Coherence or Inter-ChannelCorrelation) and the whole phase place difference (OPD:Overall Phase Difference).
IID (or CLD) is the strength difference that is showed by the motivation level of at least two channel signals being comprised according in multi channel audio signal, and ICC is the degree of association between two channel signals showing of the similitude according to the waveform of at least two channel signals that in multi channel audio signal, comprised.IPD shows the phasic difference between quilt at least two channel signals that comprise in multi channel audio signal, and OPD shows the phasic difference between quilt at least two channel signals that comprise is how benchmark distributes with the simple signal in multi channel audio signal between two channels.
And according to one embodiment of present invention, first encoder 120 generates second audio signal based on spatial audio coding (SAC:Spatial Audio Coding) algorithm, and extracts spatial parameter.
According to one embodiment of present invention; First encoder 120 utilizes in dynamic image expert group surround sound (MPEG surround) encryption algorithm, auditory localization clue coding (SSLCC:Sound SourceLocation Cue Coding) algorithm and the binaural cue coding (BCC:Binaural Cue Coding) to generate said second audio signal, and extracts said spatial parameter.
In second encoder, 130 coding first audio signals and second audio signal at least one is to generate the audio signal of coding.
Owing to be used according to the code device of audio signal of the present invention is relevant with the satellite dmb service, second encoder 130 is according to encode in first audio signal and second audio signal at least one of satellite dmb standard, the audio signal of encoding with generation.
The audio signal of 140 pairs of codings of multiplexer and spatial parameter carry out multiplexed, to generate satellite dmb stream.
According to one embodiment of present invention, the code device 100 of audio signal may further include the packing device (not shown).
The elementary stream (PES:packetized Elementary Stream) that said packing device is packaged as packing with the audio signal and the said spatial parameter of said coding.At this moment, said multiplexer is multiplexed to generate said digital multimedia broadcast (dmb) via satellite stream with the elementary stream of said packing.
Therefore, audio signal encoding apparatus 100 according to the present invention has the compatibility with existing satellite dmb system, and compares with the stereo audio signal service multichannel audio that has more presence service can be provided.
Fig. 2 is the block diagram that illustrates according to the structure of the satellite dmb service generator of the code device with audio signal of exemplary embodiment of the present invention.
Satellite dmb service generator 200 according to the present invention comprises video encoder 210, stereo audio encoder 220, multichannel audio encoder 230, PES packing device 240, Section packing device 250 and TS multiplexer 260.Illustrate in greater detail the function of each structural element below.
The vision signal that video encoder 210 codings receive.For example, video encoder 210 can encoded video signal according to the satellite dmb standard.
The stereo audio signal that stereo audio encoder 220 codings receive.For example, stereo audio encoder 220 is according to the stereo audio signal of satellite dmb standard code reception.Second encoder 130 of the encoder 210 of stereo audio signal and Fig. 1 is corresponding.
The multi channel audio signal that multichannel audio encoder 230 codings receive.At this moment, multichannel audio encoder 230 output stereo audio signal and spatial parameters, wherein stereo audio signal is through downloading and mixing multi channel audio signal and generated, and spatial parameter is used for restoring multi channel audio signal.The stereo audio signal of downloading and mixing is imported into stereo audio encoder 220, and spatial parameter is imported into PES packing device 240.
According to one embodiment of present invention; Because satellite dmb service generator 200 can receive at least one in stereo audio signal and the multi channel audio signal; When satellite dmb service generator 200 receives stereo audio signal; The stereo audio signal that 220 codings of stereo audio encoder receive; And when satellite dmb service generator 200 receives only multi channel audio signal; Stereo audio signal that 220 of stereo audio encoders coding is downloaded and mixed, and when satellite dmb service generator 200 all receives stereo audio signal and multi channel audio signal, the stereo audio signal of 220 pairs of receptions of stereo audio encoder and download and the stereo audio signal of mixing are all encoded.Below, the signal of from stereo audio encoder 220, being exported is called as the stereo audio signal of coding.
After the vision signal of PES packing device 240 received codes, the stereo audio signal and spatial parameter of coding, this signal is packaged as the PES bag.The PES bag of in PES packing device 240, being packed outputs to TS multiplexer 260.
After Section packing device 250 receives program appointed information (Program Specific Information); With this information package is PA Section (Program Association Section), PM section (ProgramMap Section), CA section (Conditional Access Section) etc.Section packing device 205 can be SI section (ServiceInformation Section) with this information package after further receiving procedure service information.TS (Transport Stream) multiplexer 260 is with PES bag and the reception of Section bag and be packaged as MPEG-2TS, and carries out multiplexed.At this moment, Section packing device 250 is set at " User Private " with the stream shape of spatial parameter.
Fig. 3 is the block diagram that illustrates according to the detailed structure of the decoding device of the audio signal of exemplary embodiment of the present invention.
The decoding device 300 of audio signal according to an embodiment of the invention comprises receiver 310, inverse multiplexer 320, first decoder 330 and second decoder 340.
The audio signal that 330 decodings of first decoder are encoded.Decoded audio signal can comprise at least one in single audio signal and the stereo audio signal.
According to one embodiment of present invention; Second decoder 340 can restore multi channel audio signal based on the SAC algorithm, and second decoder 340 can generate multi channel audio signal based on any one in MPEG Surround encryption algorithm, SSLCC algorithm, the BCC algorithm.
In addition, according to one embodiment of present invention, second decoder 340 can further generate virtual multi channel audio signal based on decoded audio signal and spatial parameter.Virtual multi channel audio signal is meant and utilizes two loud speakers that the similar relief stereo audio signal of multichannel voice signal with 4 channels, 5.1 channels, 7.1 channels etc. is provided.That is, second decoder 340 can be exported at least one among multi channel audio signal and the virtual multi channel audio signal.
Therefore, the decoding device 300 of audio signal according to an embodiment of the invention can provide the multichannel audio service that has more presence than stereo audio signal.
Fig. 4 is the block diagram that illustrates according to the satellite dmb terminal structure of the decoding device with audio signal of exemplary embodiment of the present invention.
Satellite dmb according to an embodiment of the invention terminal 400 comprises inverse multiplexer 410, Video Decoder 420, stereo audio decoder 430 and multichannel audio decoder 440.
After inverse multiplexer 410 receives the satellite dmb bit stream; Be divided into video packets, audio pack, spatial parameter bag, program appointed information bag etc.; Through packing, extract the vision signal, the audio signal that is encoded, spatial parameter and the program appointed information that are encoded to each bag is counter.
The vision signal that Video Decoder 420 decodings are encoded.
The audio signal that 430 decodings of stereo audio decoder are encoded.Decoded audio signal is assumed to stereo audio signal.
Multichannel audio decoder 440 generates multi channel audio signal based on decoded stereo audio signal and spatial parameter.And multichannel audio decoder 440 can further generate virtual multi channel audio signal based on decoded stereo audio signal and spatial parameter.
Among stereo audio signal, multi channel audio signal and the virtual multichannel signal that the user at satellite dmb terminal 400 can select to export any one, and play its selected signal.
Fig. 5 is the flow chart that illustrates according to the coding method of the audio signal of exemplary embodiment of the present invention.
According to the coding method of the audio signal of exemplary embodiment of the present invention by forming in the handled step of the code device of audio signal illustrated in fig. 1.Therefore, though following some contents of having omitted, its above-mentioned technology contents that illustrated audio signal encoding apparatus is relevant in Fig. 1 also is applicable to the coding method according to the audio signal of exemplary embodiment of the present invention.
Step S510 receives at least one in the multi channel audio signal and first audio signal.
Step S520 generates second audio signal through downloading and mixing said multi channel audio signal, from said multi channel audio signal, extracts spatial parameter.
According to exemplary embodiment of the present invention, second audio signal can comprise at least one of single audio signal and stereo audio signal.
According to exemplary embodiment of the present invention, step S520 generates second audio signal and extracts spatial parameter based on the SAC algorithm.
According to exemplary embodiment of the present invention, step S520 generates second audio signal, the extraction spatial parameter based on one in MPEG Surround encryption algorithm, SSLCC algorithm, the BCC algorithm.
Step S530 is through audio signal that at least one generation of encoding in said first audio signal and said second audio signal is encoded.
Step S540, the audio signal of said coding and said spatial parameter are carried out multiplexed, to generate digital multimedia broadcast (dmb) via satellite stream (DMB Stream).
According to exemplary embodiment of the present invention, the coding method of audio signal may further include the PES that audio signal and spatial parameter with coding be packaged as packing and wraps.At this moment, step S540, PES bag is carried out multiplexed, to generate satellite dmb stream.
Fig. 6 is the flow chart that illustrates according to the coding/decoding method of the audio signal of exemplary embodiment of the present invention.
According to the coding/decoding method of the audio signal of exemplary embodiment of the present invention by forming in the handled step of the code device of audio signal illustrated in fig. 3.Therefore, though following some contents of having omitted, its above-mentioned technology contents that illustrated audio signal decoder is relevant in Fig. 3 also is applicable to the coding/decoding method according to the audio signal of exemplary embodiment of the present invention.
Step S610 carries out inverse multiplexer with digital multimedia broadcast (dmb) via satellite stream and extracts the audio signal that is encoded and about the spatial parameter of said audio signal.
According to one embodiment of present invention, spatial parameter can comprise at least one among IID, CLD, ICC and the OPD.
Step S620, the said audio signal that is encoded of decoding.
Step S630 generates multi channel audio signal based on said decoded audio signal and said spatial parameter.
According to exemplary embodiment of the present invention, step S630 can further generate virtual multi channel audio signal based on said decoded audio signal and said spatial parameter.
According to exemplary embodiment of the present invention, step S630 can restore multi channel audio signal based on the SAC algorithm, perhaps can generate multi channel audio signal based on any one in MPEG Surround encryption algorithm, SSLCC algorithm, the BCC algorithm.
Can be recorded in the computer-readable medium that comprises program command according to the Code And Decode method of the audio signal of exemplary embodiment of the present invention and to realize various operations through computer.Above-mentioned medium comprises independent or combines with the said procedure instruction, data file, data structure etc.Above-mentioned medium and program command can be specially for the present invention design, and also can be in computer software technology, can obtain or well-known.The example of computer-readable medium comprises magnetic medium for example hard disk, floppy disk and tape; Photoelectric medium is CD-ROM dish and DVD for example; Magnetodielectric is CD for example; Be used for storing the hardware unit with execution of program instructions with special configuration, rdma read (ROM:Read-only Memory) only for example, random access memory (RAM:Random Access Memory), flash memory etc.The example of program command comprises that machine code is for example generated by compiler and comprises the file by the higher level code that utilizes interpretive program to be performed through computer.Above-mentioned hardware unit can be configured the aforesaid operations that one or more software units are carried out above-mentioned exemplary embodiment of the present invention.
Although shown and described the present invention with reference to its certain exemplary embodiments; But it should be appreciated by those skilled in the art; Under the situation that does not break away from the spirit and scope of the present invention that define by claim, can carry out the various changes on form and the details to it.
Claims (18)
1. audio signal encoding apparatus, it comprises:
Receiver receives multi channel audio signal with the ordinary audio signal, perhaps only receive multi channel audio signal;
First encoder is downloaded and is mixed said multi channel audio signal and generates second audio signal, and from said multi channel audio signal, extracts spatial parameter;
Second encoder is to said ordinary audio signal and said second audio signal, or only to said second coding audio signal, generate the audio signal that is encoded; With
Multiplexer, the said audio signal that is encoded and said spatial parameter are carried out multiplexed, to generate digital multimedia broadcast (dmb) via satellite stream.
2. audio signal encoding apparatus as claimed in claim 1, said second audio signal comprises at least one in single audio signal and the stereo audio signal.
3. audio signal encoding apparatus as claimed in claim 1, said first encoder generates said second audio signal based on the spatial audio coding algorithm, and extracts said spatial parameter.
4. audio signal encoding apparatus as claimed in claim 1; Said first encoder utilizes in dynamic image expert group surround sound encryption algorithm, auditory localization clue encryption algorithm and the binaural cue encryption algorithm to generate said second audio signal, and extracts said spatial parameter.
5. audio signal encoding apparatus as claimed in claim 1; Further comprise the packing device that the said audio signal that is encoded and said spatial parameter is packaged as the elementary stream of packing; Said multiplexer carries out multiplexed to the elementary stream of said packing, to generate said digital multimedia broadcast (dmb) via satellite stream.
6. audio signal decoder, it comprises:
Inverse multiplexer carries out inverse multiplexer to digital multimedia broadcast (dmb) via satellite stream, and extracts the audio signal that is encoded and about the spatial parameter of said audio signal;
First decoder, the said audio signal that is encoded of decoding; With
Second decoder is uploaded said decoded audio signal and is mixed based on said spatial parameter, from this digital multimedia broadcast (dmb) via satellite stream, to restore multi channel audio signal.
7. audio signal decoder as claimed in claim 6, said second decoder further generates virtual multi channel audio signal based on said decoded audio signal and said spatial parameter.
8. audio signal decoder as claimed in claim 6, said second decoder generates said multi channel audio signal based on the spatial audio coding algorithm.
9. audio signal decoder as claimed in claim 6, said second decoder utilize in dynamic image expert group surround sound encryption algorithm, auditory localization clue encryption algorithm and the binaural cue encryption algorithm to generate said multi channel audio signal.
10. audio-frequency signal coding method, it comprises:
Receive multi channel audio signal with the ordinary audio signal, perhaps only receive multi channel audio signal;
Download and mix said multi channel audio signal and generate second audio signal, and from said multi channel audio signal, extract spatial parameter;
To said ordinary audio signal and said second audio signal, or, generate the audio signal that is encoded only to said second coding audio signal; With
The audio signal that is encoded and said spatial parameter are carried out multiplexed, to generate digital multimedia broadcast (dmb) via satellite stream.
11. audio-frequency signal coding method as claimed in claim 10, said second audio signal comprises at least one in single audio signal and the stereo audio signal.
12. audio-frequency signal coding method as claimed in claim 10, the step of said extraction spatial parameter generates said second audio signal based on the spatial audio coding algorithm, and extracts said spatial parameter.
13. audio-frequency signal coding method as claimed in claim 12; Said generation second audio signal and the step that extracts said spatial parameter; Utilize one in dynamic image expert group surround sound encryption algorithm, auditory localization clue encryption algorithm and the binaural cue encryption algorithm to generate said second audio signal, and extract said spatial parameter.
14. audio-frequency signal coding method as claimed in claim 10; Further comprise the step that the said audio signal that is encoded and said spatial parameter is packaged as the elementary stream of packing; The step of said generation digital multimedia broadcast (dmb) via satellite stream; The elementary stream of said packing is carried out multiplexed, to generate said digital multimedia broadcast (dmb) via satellite stream.
15. an audio signal decoding method, it comprises:
Digital multimedia broadcast (dmb) via satellite stream is carried out inverse multiplexer, and extract the audio signal that is encoded and about the spatial parameter of said audio signal;
The said audio signal that is encoded of decoding; With
Said decoded audio signal is uploaded and mixed based on said spatial parameter, generate multi channel audio signal from this digital multimedia broadcast (dmb) via satellite stream, to restore.
16. audio signal decoding method as claimed in claim 15, the step of said generation multi channel audio signal further generates virtual multi channel audio signal based on said decoded audio signal and said spatial parameter.
17. audio signal decoding method as claimed in claim 15, the step of said generation multi channel audio signal generates said multi channel audio signal based on the spatial audio coding algorithm.
18. audio signal decoding method as claimed in claim 15; The step of said generation multi channel audio signal utilizes one in dynamic image expert group surround sound encryption algorithm, auditory localization clue encryption algorithm and the binaural cue encryption algorithm to generate said multi channel audio signal.
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| KR20080079282 | 2008-08-13 | ||
| KR79282/08 | 2008-08-13 | ||
| KR1020080130999A KR20100020889A (en) | 2008-08-13 | 2008-12-22 | Method and apparatus for encoding and decoding audio signal |
| KR130999/08 | 2008-12-22 |
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|---|---|---|---|---|
| CN1589466A (en) * | 2001-11-23 | 2005-03-02 | 皇家飞利浦电子股份有限公司 | Audio coding |
| CN1926610A (en) * | 2004-03-12 | 2007-03-07 | 诺基亚公司 | Synthesizing a mono audio signal based on an encoded multi-channel audio signal |
| WO2007110101A1 (en) * | 2006-03-28 | 2007-10-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Enhanced method for signal shaping in multi-channel audio reconstruction |
| CN101180674A (en) * | 2005-05-26 | 2008-05-14 | Lg电子株式会社 | Method of encoding and decoding an audio signal |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1589466A (en) * | 2001-11-23 | 2005-03-02 | 皇家飞利浦电子股份有限公司 | Audio coding |
| CN1926610A (en) * | 2004-03-12 | 2007-03-07 | 诺基亚公司 | Synthesizing a mono audio signal based on an encoded multi-channel audio signal |
| CN101180674A (en) * | 2005-05-26 | 2008-05-14 | Lg电子株式会社 | Method of encoding and decoding an audio signal |
| WO2007110101A1 (en) * | 2006-03-28 | 2007-10-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Enhanced method for signal shaping in multi-channel audio reconstruction |
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